I have an many-to-many relationship mapped with annotations
I am updating the UserGroup by doing:
I am getting this exception:
If i remove cascade=CascadeType.ALL from Group entity i
don't get any exception but i want to keep cascade in Group entity.
Is there anything i need to do to get rid of this exception or I should
remove cascade in Group entity?
I think this means the primary key of the object you are trying to delete is null. Can you verify this by doing some logging? So, if the primary key is null and you ask Hibernate to delete it, it won't know what row in the underlying database to delete.